Repeating firearm



Aug. 28, 1934. .1. E, BowNlNG REPEATING FIREARM' Filed Sept. 17, 1952 B'Sheets-Sheet l mmf @s Nm@ Jonthan EBrou/ning Aug. 28, 1934. .1. E. BROWNING 1,971,597

REPEATING FIREARM Filed sept. 17, 1932 2 sheets-sheet 2 Jona han E'Brown i n3 @www V f 1% m@ e MM Q NQ Q@ N I@ L Patented Aug. 28, 1934 REPEATING FIREARM Aprlioation September 17, 1932. Serial, No-I 6.33650 15V Claims.

rlhis invention relates to firearms, and especially to firearms of the shotgun class, particular reference beine Jood to the type wherein the shells are transferred tothe barrel lfrom a noteer` l! eine loooted beneath the barrel.-

An aim of the present invention is to provide an improved arrangement wherein thevarious parts within the receiver are so constructed and arranged that the receiver may be made relatively narrow and will not extend above the top surface of the barrel to lany appreciable extent. With my improved arrangement, the necessity of Infiaterially elevating the sights above the barrel is avoided, a relatively wide eld of vision spermittedn aiming the aun, and .the elm has a comfortable and better feel.

A further object of the invention is to provide an improved firearm of this kind-having Various features of novelty and advantage and which particularly characterized by its simplicity and economy in construction, the ease and facility with which the parts may be assembled, and its effectiveness in operation.

Other objects will be in part obvious and in pointed out more in detail hereinafter.

The invention accordingly consists in the fea--v tures oi construction, combination of elements and anfangement of parts which will be exemplified in the construction hereinafter set forth andv 0 the scope of the application of which will be indi.- cated in the appended claims.

Inv the accompanying drawings: Figure l is a right-,hand side elevational view of as much of the gun as is necessary to illus,- 5 trate the features of the present invention, the

receiver being shown in longitudinal vertical section and the breech block being sho-wn as having been manually brought Vto full withdrawn or retracted position; y e 0 Fig. 2 a view similar to Fig. 1 and showing certain parts in longitudinal vertical section and the breech block in its normal or forward .po. sition;

Fig. 3 is a side elevational'view of the Yfnk which 5 moves the locking .block into unlocked position, a

portion of the breech block also being illustrated; Fig. 4 is a top plan view of the link, together with the operating slide for manually retracting 0 the link together with the breech block;

Fig. 5 is a top plan View of the llocking blocl; Fig. 8 is a view looking at the rear ends of the barrel extension and breech block,-th is View being taken substantially on line 6-'5 of Fig. 2, and the 5 link 57 and locking block being omitted;

Fia '1- is e. front elevational View of the breeeh bloom, Y

Fie. 8 is a bottom plan view thereof:

Fie. 9 is e transverse seotiooel view token. Subeteotially line 9,-.-9 of Fig- 2:

,Fia 1.0 is. a top pleo View of the Carrier With a portion of the trigger plate and a portion of the receiver, the latter beine ,shown irl longitudinal section; and n Fig. 1 1 is a bottom plan view of the barrel extension, Referring to the drawings in detail, 10 designates a receiver having an opening 11 in its o'rr werden@ adopted to receive the rear or extension portion .1.2 ofthe barrel 13. Located below the opening 11 is another opening 1&1 which receives theusual magazine 15 within which is a follower 16 backed up by a spring 17. About this maga.- zine is a spring j18 which cooperates with the' barrelin such manner as to normally urge the barrel forwardly. The connection between the spring vand the barrel is not illustrated, as that arrangement is an old and well-known one. 'E X.- tending rearwardly from the receiver and adapted to be used within vthe butt stock (not shown) is a tang 1 9 in the form of a slotted tube within which is. located a compression spring 20 which normallyurges the breech block 2l forwardly, as hereinafter described more in detail. 4O n the .opposed inner walls of the receiver are longitudinally extending ribs 22 upon which the barrel extension rests, as shown more clearly in Figs. 1 and 6.

Closing the rear portion of the opening in the bottom of the receiver is a trigger plate having a bottom wall 31 and parallelside'flanges 3 2, the latter 4fitting closely between the side walls of the receiver, as shown more clearly in Fig. 9. As shown in -Fig. `1, the forward edges of the flanges 32 are provided with notches 33 which receive lugsl on the receiver, and the trigger plate is removably anchored to the receiver by alpin 3,5. Pivoted to the trigger plate, as at 36, is a trigger 3 7 which may be o f the usual construction, .it hav.- rie a iront notelo 37 ood a rear one 37- The trigger is normally `urged into unpulled or nor?v mal position by o Spring '3,8 mounted in a bore in the trigger itself and bearing against the bottom wall or the trigger plate. Pivoted to the trigger plate, as on a pin 39, is a hammer 40 which also isshown as being of an old construction, This hammer is normally urged forwardly by a main spring el cooperating with a plunger .e2 which is pivoted to the hammer, as at 43.

Between the trigger plate and the magazine is a shell chamber 44 open at its top and its bottom,

f L generally of an old construction but, in accord- 'A' carrier, designated generally by the numeral '50,' and fshown' most 'clearly'in Figs.-i 1, 2 and 10,r

is employed for transferring the shells from this.

' f chamber up to and into'the barrel extension. The

' forward end'o thecarrier has a shell supporting plate 51 located in the shell chamber. lThe rear f end of the carrier is bifurcated to Aprovide a'pair f of arms' 52,' the Aspace 'between' whichy accommo` f dates the' trigger 37, the plunger 42 and the ham' 1 mer 40. f rExtending rearwardly from one of lthese armsisa carrier sear .53-y which, .as hereinafter described more' in detail, is' adapted'to lockfthe- 'lbreech biock in retracted position; This sear is' pivoted as at 48 and is normally urged upwardly and forwardly Aby a spring '49. This' carrier is ance with .ther present invention, I ,provide cer,-

tain improvements therein whichfmaterially ree" duce the ycost of manufacturing. the ysame and.

. which allow of a lmoreready assembly; `The, arms '52 have o'ppositeiy extending,l aligned.' integral'l trunnions 54, Vand these trunnions are removably trigger plate is assembled Within the receiver,

thesetrunnions lieimmediately beneathfthe ribs'y 22 of the receiver and, if desiredalthough not tru'nnions;A With this'arrangementthe carrier latter is inserted inthe receiver) by merely engaging the trunnionsin'the openbearings55 and, after the trigger plate has. been assembled'in the receiver, displacement of the carrierl is prevented bythe ribs 22 (see Figf9). l' l l position,- the linl: 57 associated with that block, as hereinafter described more indetail, .engages the carrier sear 53 thereby rocking the forward end. or plate 51 of the carrier upwardly to transfer a breech block is moved from retracted to forwardposition. For the purpose of resiliently holding the carrier in each of its extreme positions and also completing the movement of the carrier after such movement has been initiated, there is provided (as shown in Fig. 2) a spring pressed plunger 59 carried by the left hand arm 52 of the carrier and cooperating with a wedge-shaped cam or nose 60. The spring behind the plunger is designated by the numeral 61. It will be observed that, by mounting the plunger 59 and spring 61 on the carrier, these parts may be assembled before the carrier is positioned in the trigger plate.

At one side of the plate 51 of the carrier is an upwardly facing ledge or abutment (see Fig. 10), and pivoted on the inner side of the right hand side wall or" the receiver is a carrier latch 66, the rear end 57 of which is inturned so as to extendv over the ledge 65 and lock this carrier in lowered or receiving position. This latch is pivoted as at 68 and has, adjacent its forward end, a push pin or finger piece 69 projecting through an opening in the side wall of the receiver. The latch is normally urged to the latching position shown in Fig. 10 by a spring 70. The extreme forward end 71 of the latch constitutes an initial stop for preventing, at cer-V ing the hammer.

tain times, a shell from moving fromthe magal Laine into ythe shell chamber 44. .This latch 66 is of la welk-known' construction, and a description a'spring L74. This stop has'a lug 75with which cooperates a cam 76' on the barrel' extension, as Rearvvardly of shown most clearly in Fig. 11. this cam .is a surface' '-7.6' 'which holdsthe stop tion,l .and a .description ofy its; operation will rbe reserved for gthe present.` f f I I lout of operation when the barrel' dis in forward`r l .y position. This stop is lof a well-known construc-A Referring now to the barrel extensionthe same y lhasA anA opening in itsl bottom, theedge of which opening is designated lby` the numeral 85.y This.r :opening is adapted to register withthe shell .chamber when the barrel is in forward position.

The extension is'open at oneside, as at. 86,2 and the top wall is cutA away at 'the rear, as at .87. The'lower- 'edges of the 'side walls 84, and 84 ofthe barrel'extensiong rest upon and have a sliding movement on .the ribs 22, as shownl most clearly in Fig. 6. :YAt the rear endr of thebarrel extension, and' behind the'. opening 85 therein, .f is a cross piece or member 88 which, as herelinafter described more in detail,r rconstitutes an =abutment withl which fthe locking bloei:A cooper-. .f

ates, meansfor controlling movement of the sup= plemental cartridge stop: 130, and means for coek- 1 On .the left hand .side wall of. the barrel extension is the usual shell ejector in. f l the formof an.: abutment 89 which, when the When the breech block is moved to retractedl barrel jumps forwardly', engages behind one side edge of the head `of the shell, thereby throwing it out.:

Referring lnow left hand side thereof is adapted to engage the left hand wall of the barrel extension and is provided with a groove 90 for accommodating the ejector 89. The right hand side of the breech block is rabbeted' so as to provide a surface 91 which rests and slides upon the right hand wall 84' rof the barrel extension. The rear end of the breech block is recessed on its under side, as at 92,'and in the top of this recess and forwardly of the rear end of the breech block is a rearwardly facing shoulder or abutment 93 with which the link 57 is adapted to cooperate, as hereinafter described more in detail. Extending forwardly from the recess is a bore 94 in which the firing pin 95 is slidably mounted. This has, at its rear end, a downwardly extending projection 96.

Located within the recess 92 of the breech block is a locking block 100, shown most clearly in Figs. 2 and 5. This block is pivoted at its forward upper corner on a pin 101 and has, at its rear end, a rearwardly facing shoulder 192 above which are rearwardly extending ears 103. The central ear 103 has a cam surface 104 so disposed with reference to the projection 96 of the firing pin that, when the locking block is raised from the position shown in Fig. 2 to that shown in Fig. 1, the firing pin will be withdrawn to the position shown in Fig. 2.

Cooperating with the locking block and the breech block is the link 57, shown most clearly in Figs. 3 and '4. The rear end of this link engages a follower at the forward end of the spring 20. The link is bifurcated for the major to. me breech' block.. partieuiar. reference being'had to Figs. 1, 2', 7 and k8, the' portion of its length so as to provide a pair of 15 :ontimodatesv:the` hammer. Jv`:F .acharm 111 is avded, at its extreme forward end with a nose 2, which are adapted -to engage .behind the oulder-eS-onflthe breech block;.as shown in Fig.

Rearwardly of these noses are downwardly and de is accommodated by a channel or groove 121 Y the right side of the breech block (see Figs. 6 andf and it has a nger piece 122, the neck of which accommodated by a slot V123 in the side wall of e receiver. The rear end of this operating slide .s a pair of spaced lugs 124 (see Fig. 4) profling a groove therebetween for the reception of e rib 4115 provided on the link 57; On the fortrd endof the breech block is the usualextractor which', `when vthe breech block moves reartrdly, draws'the fired shell with it in the orditry manner. v y

Carried by the breech block is a supplemental rtridge stop 130, the movement'ofwhich into ld out of-operative position is controlled by a lative movement between the breech block'and e barrel extension. In the present illustrative sclosure, this cartridge stop is in the form of a ver accommodated by a groove 131 in the ander ie of thebreechblock. The lever is pivoted, as i 132, and, when the Vparts are in the position town in Fig. 2, the forward end 133 of the lever yojectsdownwardly `into the path of -movement the shell within the magazine. The rear end the lever is-in the form of a tail 134 disposed at 1 angle tothe front'arrn of the lever, and behind om the hammer, whereupon the hammer luis ment of this slide, the link 57 is moved rearwardly `with respect tothe breech block, where-I fleased so as to strike the rear end of the firing n, the latter being thereby advanced slightly om thepositionfshown in Fig. 2. (It may here a statedthat the trigger has the rear trigger )tch 3'7" adapted/to cooperate with a rear immer notch in order to makethe gun semiitomatic in a manner well understood.) When 1e shell is fired,'the breech block is moved :arwardly and, due to the fact that the locking ,ook is in the locking relation shown in Fig. 2 ith respect'tothe cross piece 88 of the barrel rtension, the barrel will move backwardly or :coil with the breech block. Asthe breech block 1d barrel movefrearwardly, the cross member 88 ill wipe against the hammer and thereby bring 1e hammer to a position where the rear trigger etch 37'.' engages the rear hammer'notch so .ng as the trigger is held pulled. Also, the link will be moved rearwardly thereby placingfthe impression spring under compression and, as iis link is 'movedrearwardly its rear` endmoves lt downwardly dueito the downward inclination ofy -the tang 19. This means-that the forward -end Y ofl vthe .linkis Afturnedor rocked y counterclockwise aboutthe'pin 114,-referencefbeing had tovFig. 2. i

"Also, upon'rearwardmovement vof the link 5-7,

the lowerend of :therib115'willwipe along ,the

carrierzfsear therebyvl depressing the latter. As the breech-'blockisl-broughttolthe full retracted position shownv in` Fig. 1,-'Jthe lever V57 Vswings to a position where the nose 112 engages the shoulder oft-abutmentQS ofthe breech block. YThe breechA block and barrelfhaving` completed the -recoil movement,-the rebound of thebarrel, to-

gether with the spr-ing 18, will throw the barrel -forwardly to the position shown in Fig. 1 but;

due tothe engagementof thecarriersear with the projection 116 of'thelink 57 I(as'shownI inw Fig. 1l; this link'cannot move forwardly with the barrel and, since the breechblockis connected to the link throughthe locking block and pin 114, the breechfblockwill be held back in retracted .positionf Now, owing to the fact that the link is held back -by vthe carrier sear and the barrel v vmagazine actuates the carrierlatch 66, as hereinafterdescribed more in detail, whereupon the rear end of the 'carrier will swing downwardly,

and the forward end of thefcarrier will swing upwardly so -as to transfer-the shell which has been deposited on the plate 51 into the barrel extension and in front Yof` the now advancing breech block. When the rear end of the carrier thus moves downwardly, the carrier sear 53 is released from the vtooth 116 and thereafter the spring-20' urges the link 57-and the breech block forwardly so that the shell,`which has been fed into the barrel extension, is forced into a barrel. Duringthis forward movement of the link, the nose 112-thereof is in engagement with the abutment 93.'r Asthe breech block completes its forward movement, the nose of the link is disengaged from the abutment 93, thus permitting the locking block to swing downwardly to the locking position shown in Fig. 2.

If it 'is desired to retract the breech vblock without firing the gun, this may be manually done by pushing rearwardly on the finger piece of the operating -slide V120. On initial rearward moveupon the locking block is moved upwardly from locking position with respect to the cross piece 88 of the barrel; Then, ofcourse, the link, breech block; and locking block are moved backwardly in unison to the position shown in Fig. 1.

The operation of the several cartridge stops is briey vas follows: When the gun .is in normal position; shown in Fig. 2, and it is desired to fill the magazine, the carrier-latch is disengaged. from the carrier: by pressing in on the button 69 and then theforward end 71 ofVv this latch extends into the range ofthe magazine so as to prevent any of the shells from coming out of the magazine. The carrier plate can now be pushed upwardlyso as to feed the shells into the magazine serted'into the1magazine,-.from iflyingiloutibeforeit is latched by the end 71 of the carrier latch. The carrier latch is now released and theY head of the rearmost cartridge in the magazine will engage against the forward end 133 of the lever 130. At this time, the barrel being forward, the secondary cartridge stop 72 is held in inoperative position, as shown in Fig. 11. On ring the gun, the barrel and breech block will be retracted, as previously described, which means that the lever will be moved rearwardly thus permitting the rearmost shell to move back to the secondary cartridge stop 'l2 which, on initial rearward movement of the barrel section, has been released; that is, the surface 76 on the barrel extension has been moved from behind the lug 75 of that secondary cartridge stop. 'Ihe breech block is locked by the scar 53 in rearmost position, as previously described. As the barrel initially moves forward from its rearmost position, shown in Fig. l, the secondary catch is withdrawn, due to the cam 76, whereupon the shell which has been held by that catch will move backwardly and engage the inturned end 66 on the carrier latch and thus disengage that latch from the carrier. As soon as the carrier is released, the plate end 51 will be swung upwardly, due to the spring 20, so as to transfer the shell into the barrel extension immediately after the breech block has started its forward movement. As the carrier plate is moved upwardly, the plunger 59 will ride up the wedgeshaped nose 6) and, when it has passed the apex of that nose, the spring 51 behind the plunger is effective in insuring that the carrier plate will be moved upwardly to the desired extent. After the cartridge has been transferred to the barrel section and its forward end has been forced into the barrel, the advancing breech block engages the cam edge 58 on the carrier thereby starting the carrier downwardly and, after the latter has been moved by the breech block a predetermined eX- tent, the plunger 59 passes rearwardly of the apex of the wedge-shaped nose 60, whereupon the spring behind the plunger 59 will complete the downward movement of the carrier. Then, of course, the carrier catch, which has been held outwardly by the carrier, is free to swing inwardly into locking position, as shown in Fig. 10. When the breech block is retracted manually, as previously described, the rearmost shell in the magazine will follow the cartridge stop 130 until that step has been moved to the inoperative position shown in Fig. 1 and the shell will come to rest against the cross member 88 of the barrel extension. The carrier latch 66 may now be operated, whereupon the carrier will transfer the shell thereon into the barrel extension. It will be observed that, in the event the breech block is retracted manually only to a partial extent and then released, the cartridge stop 130 will force the rearmost cartridge back into the magazine.

It will be seen, from the foregoing description taken in connection with the Yaccompanying drawings, that a gun constructed in accordance with the present invention has various features of novelty and advantage. These lend substantial simplicity to the structure and economy in manufacture. It is particularly observed that the locking block is located in the lower portion of the barrel extension and particularly the cross piece 88. This arrangement permits of a relatively narrow and low receiver. It will also be observed that the cartridge stop carried by the receiver is extremely simple in construction, arrangement and operation and in no way necessitates an increase in size of any of the other parts. This cartridge stop is also operated by the cross piece 88.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

l. In a firearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in the receiver, a breech block movably mounted in the barrel extension, a pivoted locking block carried by the breech block and adapted to cooperate when in locking position with said barrel extension, whereby upon firing of the gun the barrel extension and breech block will move backwardly in unison, a spring pressed link behind `the breech block and adapted to move the latter from retracted to normal position, said link having a cam slot and said locking block having a pin engaging in saidV slot, said slot and pin being arranged to cause the locking block to move to unlocking position upon initial forward movement of the barrel extension from retracted position.

2. In a firearm of the character described, a receiver, a 'barrel having a barrel extension mounted for reciprocation in the receiver, a breech block-movably mounted in the barrel extension, a locking block pivoted to the breech block and adapted to cooperate with the barrel extension beneath the breech block, a spring pressed link adapted to move in an arc and having a nose adapted to move into and out of operative relation to the breech block, and a cam surface on said link cooperating with said locking block for raising the latter from locking position upon initial forward movement of the barrel extension.

3. In a firearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in the receiver and provided with an opening in its bottom wall and a cross piece behind the opening, a breech block adapted to move over said cross piece, a locking block pivoted to said breech block and having a shoulder adapted to engage said cross piece when the locking block is in locking position, a link behind said breechblock and adapted to move in a curved path, a spring behind said link, said breech block having a rearwardly facing shoulder and said link having a nose adapted to engage said shoulder, said link also having a cam slot, and a pin adjacent the rear end of said locking block engaging in said slot, said slot being so arranged thatvupon forward initial movement of the breech block said locking block will be raised from locking position.

4. InV a rearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in the receiver and pro- I vided with an opening in the bottom wall and a cross piece behind the opening, a breech block mounted for reciprocation in the barrel extension, a locking block pivoted to the breech block and adapted to cooperate with said cross piece to rei strain said -breeclif block -againstmovement rela-v L tive to'said barrel extension, a trigger mechanism,r

i. .havingifa hammer, camfzmeans forV releasing said block and afsurface-y on :said cross .piece adapted receiver, 'a-` barrel v-'havinglf-a-v vbarrel extension,l provided withan openinglinl its -bottom wall and to Vmove 'saidzhammerto cocked positionl when the barrelV extension-moves to retracted position.

-5. Ina=rearm ofthe-character described, a

a cross piece behind the opening,v a breechV block #mounted-for-reciprocation over said cross piece,`

a locking block carried by the breech block and adapted to cooperate with said cross piece, and a cartridge stop movably carried by thel breech block and moved by said cross piece to operative position as the breech block moves to normal position.

6. In a rearm of the character described, a receiver, a barrel having a barrel extension provided With an opening in its bottom wall and a cross piece behind the opening, a breech block mounted for reciprocation over said cross piece, a locking block carried by the breech block and adapted to cooperate with said cross piece, a cartridge stop movably carried by the breech block and moved by said cross piece to operative position as the breech block moves to normal position, and trigger mechanism having a hammer arranged to be moved by said cross piece into cocked position upon rearward movement of the barrel extension.

7. In a firearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in the receiver and having an opening in its bottom wall provided with a cross piece, the inner surface of the top of said receiver being in close contact with said barrel extension and substantially in alinement with the upper surface of the barrel, a breech block mounted for reciprocation in the barrel extension, a locking block movable relative to and carried by the breech block and adapted for locking cooperation with said cross piece, a spring pressed link behind said breech block, a cartridge carrier having a i" pivoted sear adapted to lock said link in retracted position, and an operative connection between said link and locking block for raising the latter from locking position upon initial forward movement of the barrel extension.

8. In a firearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in the receiver, a breech block movably mounted in the barrel extension, and a cartridge stop movably carried by the breech block and operated by the barrel extension when the breech block is moved forwardly relative to the barrel extension.

9. In a firearm of the character described, a receiver, a barrel associated therewith, a magazine below the barrel, a shell chamber in the receiver behind said magazine, a trigger plate behind said shell chamber and having a pair of flanges fitting between the side walls of said receiver, said anges having open bearings in their upper edges, and a pivoted cartridge lcarrier having trunnions located in said open bearings.

10. In a firearm of the character described, a receiver having internal longitudinally extending ribs, a barrel extension, a breech block, a magazine, a trigger plate, and a cartridge carrier for transferring shells from the shell chamber behind the magazine to said barrel extension, said trigger plate having a pair of side anges provided with open bearings in their upper edges, said cartridge :carrier having trunnionslocated in said open bear- ,ingsfand heldin place therein by :said ribs.

11. In a firearm of the character described, a

l receiver having a shell chamber, a barrel having a barrel, extension above .said chamber, a breech block, a cartridge carrier pivoted in said receiver and having .a forward end portion adapted to transfer shells from the shell chamber to said barrel-extension, means/for rocking said cartridge plete the movement of said carrier in both directions.

12. In a firearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in said receiver, a magazine located beneath said barrel, a shell chamber in said receiver behind said magazine, said barrel extension being provided with an opening in its bottom whereby the interior of the extension is adapted to communicate with said shell chamber for the passage of cartridges therethrough, said barrel extension also having a cross member at the rear of said opening, a breech block mounted for reciprocation in a straight line in said barrel extension, and a locking block pivoted to said breech block extending into said opening and having on its under side a rearwardly directed abutment adapted to interlock with said cross member whereby, upon firing of the gun, the barrel extension and breech block will recoil in unison.

13. In a rearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in said receiver and provided with an opening on its under side and a cross member rearwardly of the opening, a magazine located beneath said barrel, a shell chamber in said receiver behind said magazine, said shell chamber being open at its top whereby a shell may be delivered from the shell chamber to said barrel extension through said opening in the bottom of the latter, a pivoted cartridge carrier in said receiver for receiving cartridges from the magazine and delivering them from the shell chamber to said barrel extension, a breech block mounted for reciprocation in said barrel extension, and a locking block pivoted to said breech block extending into said opening and having, adjacent its rear end, a rearwardly directed abutment adapted to interlock with said cross member forming the rear end of said opening whereby said barrel extension and breech block will recoil in unison upon firing of the gun and throughout substantially the length of travel of said breech block.

14. In a firearm of the character described, a receiver, a barrel having a barrel extension mounted for reciprocation in the receiver and provided with an opening in its bottom, a magazine below said barrel, means for receiving cartridges from the magazine and delivering them to the barrel extension through said opening, a breech block mounted for reciprocation in said barrel extension, said barrel extension having a forwardly facing shoulder located beneath said breech block, and a locking block pivoted to said breech block and adapted, when in locking posihaving a rearwardly directed abutment adapted LEO ytracvted position.r n

IGo'said breech block and Vhaving a rearwardly facing shoulder adapted to engage said'rst shoulder when said locking block is in` locking position, a link, a spring behind said link, and a connection betweenrthe forward end of said link and the locking block constructed and arranged to raise the rear end of said block and thereby disengage said shoulders upon initial forward movement of said barrel extension and breech block from re- JONATHAN E. BROWNING. 

